Guns
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What's the first concert you ever went to?
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Things You Thought Today
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Radio Paradise Comments
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Wordle - daily game
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RightWingNutZ
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USA! USA! USA!
- black321 - Mar 29, 2023 - 7:40am
Trump
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Florida
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Make me a stereo system! (poof!!)
- kurtster - Mar 29, 2023 - 12:40am
Artificial Intelligence
- kurtster - Mar 29, 2023 - 12:27am
Twitter's finest moment
- NoEnzLefttoSplit - Mar 28, 2023 - 11:11pm
Mixtape Culture Club
- KurtfromLaQuinta - Mar 28, 2023 - 7:27pm
March 2023 Photo Theme - Bokeh
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New RP Website! (2022)
- thisbody - Mar 28, 2023 - 2:58pm
Pernicious Pious Proclivities Particularized Prodigiously
- thisbody - Mar 28, 2023 - 2:32pm
*ATTENTION*: Security Warning
- thisbody - Mar 28, 2023 - 12:49pm
Ukraine
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Eclectic Sound-Drops
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Two sexes or ? Gender as a non-binary concept
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Elvis Costello's next tour dates
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• • • The Once-a-Day • • •
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Out the window
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Baseball, anyone?
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Kids say the funniest things
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Talk Behind Their Backs Forum
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Lyrics That Remind You of Someone
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Artist Request
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Those Lovable Policemen
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ANSWERS
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Bug Reports & Feature Requests
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Searching for title
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Half the streams are down
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Immigration
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Museum Of Bad Album Covers
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Counting with Pictures
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Live Music
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Media Matters
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Russia
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Canada
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Name My Band
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What are you doing RIGHT NOW?
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Today in History
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BRING OUT YOUR DEAD
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Country Up The Bumpkin
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Photography Forum - Your Own Photos
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Military Matters
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The Obituary Page
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Outstanding Covers
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Apk Installation?
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WOW, UK Numbers?
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What Did You Do Today?
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China
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Positive Thoughts and Prayer Requests
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Environment
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Top Rated Music
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Climate Chaos
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The Grateful Dead
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Upcoming concerts or shows you can't wait to see
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What's In Your Netflix Queue?
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YouTube: Music-Videos
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You Fail !
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ROMANIA
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Earthquake
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Save The Earth
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Comics!
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21st century technology
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The Abortion Wars
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Index »
Regional/Local »
Elsewhere »
Science in the News
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Page: Previous 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Next |
cc_rider

Location: Bastrop Gender:  
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Posted:
Nov 18, 2011 - 8:36am |
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geordiezimmerman wrote: Engage...
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geordiezimmerman

Gender:  
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Posted:
Nov 18, 2011 - 6:12am |
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miamizsun

Location: (3261.3 Miles SE of RP) Gender:  
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Posted:
Oct 31, 2011 - 6:45pm |
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Red_Dragon

Location: Dumbf*ckistan 
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Posted:
Aug 18, 2011 - 10:39am |
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aflanigan

Location: At Sea Gender:  
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Posted:
Aug 11, 2011 - 9:09am |
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justlistening

Location: So. California Gender:  
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Posted:
May 31, 2011 - 3:45pm |
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For 4,500 years, no one has known what lies beyond two stone doors deep inside the monument By Andrew Johnson
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Red_Dragon

Location: Dumbf*ckistan 
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Posted:
May 30, 2011 - 7:43pm |
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beamends wrote: Or coffee.
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Red_Dragon

Location: Dumbf*ckistan 
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Posted:
May 30, 2011 - 7:42pm |
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helenofjoy wrote:This made my face hurt.
yes.
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jadewahoo

Location: Puerto Viejo, Costa Rica Gender:  
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Posted:
May 30, 2011 - 6:55pm |
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beamends wrote: Or coffee.
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beamends


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Posted:
May 30, 2011 - 3:26pm |
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oldslabsides wrote:I bet this makes a wave, too Or coffee.
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Lazy8

Location: The Gallatin Valley of Montana Gender:  
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Posted:
May 30, 2011 - 3:23pm |
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helenofjoy wrote:This made my face hurt.
I forgot to mention: point the knife away from your face!
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helenofjoy

Location: Lincoln, Nebraska Gender:  
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Posted:
May 30, 2011 - 3:22pm |
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Lazy8 wrote: oldslabsides wrote:now wait a minute...What if this were filmed from above the trombone? Or from beneath; would the "shockwave" still be in the shape of an arc? Something about the perspective here just doesn't seem real to me. Yes. Shockwaves are a finite thickness, and what you see is the light bending as it passes thru the shockwave. From the side the light passes thru more of the shockwave along the leading surface of the shock than is does behind the leading surface on its way to you, so you see it in profile. Here's a way to think about it that might help: hold an imaginary half of a pumpkin in your hand with the guts all scooped out. It's a pretty much a uniform thickness. Now imagine you have a long pumpkin-carving knife you can poke thru the pumpkin, and poke it thru near the open end of the pumpkin, all the way across. It goes thru nearly perpendicular to the outer surface, which penetrates nearly the minimum amount of pumpkin possible while still getting thru both sides. Now poke it thru sideways across the bottom of the pumpkin. Since it goes thru the wall at a shallower angle it goes thru more pumpkin on its way out the other side. Poke it thru low enough and its whole trip thru will be inside the wall of the pumpkin. A ray of light taking that path will see the maximum amount of distortion from the differential index of refraction of the shock wave—not because it spent more time in the different index, but because it had farther to go before its path straightened out again when it reached undisturbed air on the other side. So rays of light along the leading surface of the shock will appear to show it in cross-section. This made my face hurt.
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Lazy8

Location: The Gallatin Valley of Montana Gender:  
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Posted:
May 30, 2011 - 3:16pm |
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oldslabsides wrote:now wait a minute...What if this were filmed from above the trombone? Or from beneath; would the "shockwave" still be in the shape of an arc? Something about the perspective here just doesn't seem real to me. Yes. Shockwaves are a finite thickness, and what you see is the light bending as it passes thru the shockwave. From the side the light passes thru more of the shockwave along the leading surface of the shock than is does behind the leading surface on its way to you, so you see it in profile. Here's a way to think about it that might help: hold an imaginary half of a pumpkin in your hand with the guts all scooped out. It's a pretty much a uniform thickness. Now imagine you have a long pumpkin-carving knife you can poke thru the pumpkin, and poke it thru near the open end of the pumpkin, all the way across. It goes thru nearly perpendicular to the outer surface, which penetrates nearly the minimum amount of pumpkin possible while still getting thru both sides. Now poke it thru sideways across the bottom of the pumpkin. Since it goes thru the wall at a shallower angle it goes thru more pumpkin on its way out the other side. Poke it thru low enough and its whole trip thru will be inside the wall of the pumpkin. A ray of light taking that path will see the maximum amount of distortion from the differential index of refraction of the shock wave—not because it spent more time in the different index, but because it had farther to go before its path straightened out again when it reached undisturbed air on the other side. So rays of light along the leading surface of the shock will appear to show it in cross-section.
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Red_Dragon

Location: Dumbf*ckistan 
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Posted:
May 30, 2011 - 8:13am |
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ptooey wrote:We're a little short on brass instruments, actually. I've got 2 guitars, a drum set, a piano, and a harmonica (oh, and I'm expecting a ukulele on Thursday  .) The kids have an accordion and a cello.  I bet this makes a wave, too
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ptooey

Location: right behind you. no, over there. Gender:  
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Posted:
May 30, 2011 - 8:05am |
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NoEnzLefttoSplit wrote:
Yeah, but what about the trombone?
We're a little short on brass instruments, actually. I've got 2 guitars, a drum set, a piano, and a harmonica (oh, and I'm expecting a ukulele on Thursday  .) The kids have an accordion and a cello.
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NoEnzLefttoSplit

Gender:  
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Posted:
May 30, 2011 - 8:02am |
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ptooey wrote: Yeah, I've got a couple of old scientific surplus catalogs sitting at the house. I'll check into what they've got. It really doesn't look all that tough.
Yeah, but what about the trombone?
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ptooey

Location: right behind you. no, over there. Gender:  
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Posted:
May 30, 2011 - 7:58am |
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ScottFromWyoming wrote: I thought that might be trouble $250 is the price for new. Talk to someone there about what you need: a mirror out of a trashed telescope, it can have some scratches, I doubt that will matter much. Yeah, I've got a couple of old scientific surplus catalogs sitting at the house. I'll check into what they've got. It really doesn't look all that tough.
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ScottFromWyoming

Location: Powell Gender:  
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Posted:
May 30, 2011 - 7:56am |
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ptooey wrote: Dammit. Dammit, dammit, dammit.
*heads off to e-bay*
Edit: $250 for an 8" mirror. Ahh. Nope.
 I thought that might be trouble $250 is the price for new. Talk to someone there about what you need: a mirror out of a trashed telescope, it can have some scratches, I doubt that will matter much.
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Red_Dragon

Location: Dumbf*ckistan 
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Posted:
May 30, 2011 - 7:47am |
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ptooey wrote: Dammit. Dammit, dammit, dammit.
*heads off to e-bay*
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ptooey

Location: right behind you. no, over there. Gender:  
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Posted:
May 30, 2011 - 7:44am |
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ScottFromWyoming wrote: Dammit. Dammit, dammit, dammit. *heads off to e-bay* Edit: $250 for an 8" mirror. Ahh. Nope.
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